For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningOverlap/Backing Plate Sectioning (Welding)
Warning: Refer to Approved Equipment for Collision Repair Warning in
the Preface section.
Fit the service panel to the vehicle to ensure a proper fit.
Measure and mark a line at the sail panel 120 mm (4 3/4 in) from the
back glass opening and 70 mm (2 3/4 in) rearward from the ...
Safety Belt Reminders
Driver Safety Belt Reminder Light
There is a driver safety belt reminder light on the instrument cluster.
When the vehicle is started, this light flashes and a chime may come on to remind
the driver to fasten their safety belt. Then the light stays on solid until the
belt is buckled.
This c ...
SIR Identification Views
The SIR Identification Views shown below illustrate the approximate location
of all SIR components available for the vehicle. This will assist
in determining the appropriate SIR Disabling and Enabling for a given service
procedure, refer to SIR Disabling and Enabling.
Front End Sensor-- ...